Refillable fuse-plug.



' J. G. CLEMENS.

REFILLABLE FUSE PLUG. APPLICATION men MAY 25.19.15."-

. 8mm v J6 @(ewfps 189mm Patgta Mali 7, 1916.

UNITED STATES oi lucii.

JOHN G. CLEMENS, or Bernardo, YORK.

. REEILLABLE rusii-i rlu f i invention being the provision of a reigew'able fuse plug in which the fuse may be applied without the use of solder, one end of the fuse itself'constituting one of the plug contacts and the other end being merely bound in; place by the usual'contact ferrule of the plug. itself.

A still further object of my invention consists in providing for afuse plug construction such thatthe plug may be manufactured at substantially the same cost as the plugs now in use and utilized with the usual fuse plug sockets. And a still further object of my invention is the provision of a fuse plug of such a nature that it does not require any particular type or style of fuse or a fuse of unusual construction, the plug being adaptedto receive'the ordinary strip of fuse metal without any previous shaping or preparing the metal.

With these and other objects in view, my invention will be more fully described, illustrated in the accompanying drawing, and

I the body tact ferrule 11, cap 12 and fuse 1 3. The body portion or plug 10 may bemade of any then specifically pointed out in the claims which are attached to and form a part of this application.

In the drawing: Figure 1 is a perspective view of my, improved fuse plug; Fig. 21s a central, longitudinal, sectional view taken through the fuse plug and fuse; Fig. 3 1s a transverse sectional view takenon the line 3-3 of Fig. 2, looking in the direction of the arrows.

2 Corresponding and like parts are referred to in the following description and indicated in all the views of the drawing by the same reference characters.

My improved fuse plug primarily includes portion or plug proper 10, the consuitable insulativ'e material, preferably porcelain, and, "is:;substantially cylindrical 1n Specification of Letters Patent.

' socket.

Patented Mar. 7, 1916.

Application filedMay 25, 1915. Serial No. 30,416.

shape, being formed with a cylindrical socket 14 opening through the outer or front end of the plug. This plug 10, at its inner or rear end, is reduced slightly and externally threaded to receive the threaded metal sleeve or ferrule 11 which forms one of the plug contacts, as is usually the case. In slightly spaced relationto this reduced por' tion, the forward end of the plugs; formed w th an annular threaded shoulder' l5 to recelve the body portion 16 of the cap 12, this bodyportion being formed centrally with an open ng closed by a plate of isinglass 17 or other suitable transparent material, whereby the condition of the fuse may be readily determined. This annular shoulder 15 also forms a stop shoulder to limit the extent to which the plug may be threaded into its The inner end of the body portion is preferably tapered somewhat to provide a central circular face 18 which, with plugs as now constructed, usually carries a second plug contact.

In my improved fuse plug construction, the closed end of the plug 10 is provided with a slot 19 through which one end of the fuse strip 13 may be passed in order that such end may be bent over against the face 18, as shown at 20, to in itself provide the second contact of the plug. Furthermore, the intermediate portion of the outer face of the plug is formed with a longitudinal channel 21 intersecting certain of the plug threads which engage the threads of the contact ferrule or sleeve 11 and the forward portion of the plug is formed with a recess or slot 22 which communicates between the socket 14 of the plug and the groove or channel 21. As will best be seen by reference to Fig. 2, the free end of the fuse 13 is bent in such a manner as to pass through the slot 22 into the groove 21 and rest across one or more of the threads of the plug in order that it may be clamped in close contact with the ferrule 11 when the latter is threaded upon the plug. e

Preferably, the plug, at a point beyond the outer end of the groove 21, is formed with a recess 23 into which the end of the fuse may be bent in order that the fuse will not have a tendency to follow the movement of the ferrule when the latter is being turned on or off the plug.

The operation of my improved fuse plug is identical with that of other plugs and need not be described. I will. however, ex-

40 end of the plug and binding the-adjacent plain the mjanner in which the fuse may be renewed;II-;If ,afuse burns out in one of my plugs, the cap 12"and ferrule 11 are both removed from the plug and the remains of the fuse may then be readily removed. A

suitable length of fuse metal or ribbon is then doubled substantially intermediate its "length and one end passed through the slot 22 and the other through the slot 19, 'the latter end beingbent againstthe closed end of the plug --.and the former being then,

clamped in place and incontact with the.

' contact sleeve or ferrule 11 by replacement of suchsleeve. The cap 12' is then applied when thefplug is again ready for use.

It will of course be understood that although -I"have illustrated 'and described my'invention inall its details, I donot wish to' be limited -to such details, as varierujs' minor changes, within the scope of the'apf pended claims, may be' made at any" time without in the slightest "degree departing from the spirit of my invention.

' Having thus described the invention,.'what is claimed as new I u I ..1. A renewable fuse plug including a 'socketed plug proper having openings lnits end and side and having its inner end externally threaded and formed with a channel communicating with the opening through a the side of the plug and intersecting certain of the threads, a fuse located in the socket of the plug with one terminal extended through the opening in the end of the plug and bent against such end externally and with its other terminal extending through the opening in the side of the plug and "along the channel formed therein and over certainof the uninterrupted threads, and a contact ferrule threaded upon the threaded terminal of the fuse ill-place.

2. A renewable fuse plug including a sub-7 stantiallyv cylindrical socketed xplug proper of insulating material having a slot formed in its closed end and at one side of the cen; ter of such end and haViIIgi i-I CGSS formed in its side. wall opening intoa channel formed in the outer, face .of theplug adja' cent its closed end, the closed end portion of theplug being externally threadedwith cernel, a fuse having one terminal passed,

through the slot in the 'closed end of the plug and bent over to. engagethe central tain of its threads interrupted by the-chanportion of such end and its other terminal passed through the recess and intfothe slot of the plug, andv a contact ferrule-threaded upon the plug and clampingly engaging. the t0 Y latterterminal of the fusen 7 opening in the end and bent over -such end,-

. bent overrthe e 1d of the plu LIZQLBSB 3. A renewable fuse plug including a socketed plug proper having openings in its end andi'side. and having itsinner end externally threaded and formed with a channel communicating with the opening. through the side of the plug and intersectingcertain of the threads-and also; formed ith a recess beyond the end. of the channel; x a fuse located in the socket of the l l i hone. terminal extended through the' 'ope'ning in-the end of the-,lplug and bent against f such s other terminal: extended ng in the side of the plug, j formed therein, over oer: terrupted threads and into end and with it the recess beyond the channel,and a con- :tact ferrule, threaded upon the end of the plug and binding the adjacent terminal of the fuse in place. I a

at. A renewable fuse plug including a 's'ocketed plug proper formed with openings {through its side and end, a fuse in the socket having a portion extending through the and a terminal passed through the opening in the side and bent toward the end, the plug being exteriorly threaded and the latter portion of the fuse. extending over certain of the threads, and a contact ferrule threaded upon. the plug and wedging a portion-of the 'fusebetween its threads and the threads of 6.,.AC renewable fuse v plu H ding 3 sockete'd-plug proper formed w'i openings in one end and its side, the end Qflthe plug being externally threaded and formed with a recess longitudinall spaced from the open- -,ing in the side, a fuse within the plug haying one-end extending through the opening in the end of the plug and bent over-the end of the plug and-sits other; terminal -pass ed through the opening in the side'fover oer: I tain of'th'e threads and seated inIth and a contact ferrule threaded socket and binding the fuse bet-it of its threads and certain of the hreadsof the plug.

In testimony whereof I affix mysignature.

' JOHN eQ CLEMENS. 

